1. Women's Health Unit, Section of General Internal Medicine, Evans Department of Medicine, Boston University Medical Center, Boston, Massachusetts.
2. Women's Health Interdisciplinary Research Center, Boston University School of Medicine, Boston, Massachusetts.
3. Section of Cardiovascular Medicine, Evans Department of Medicine, Boston University Medical Center, Boston, Massachusetts.
4. Health Care Research Unit, Section of General Internal Medicine, Evans Department of Medicine, Boston University Medical Center, Boston, Massachusetts.